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52 Manipulating Images<br />
• Threshold converts a feathered, soft-edged selection into a hard-edged<br />
selection (use Modify>Threshold). As with feathering, you won't see an<br />
immediate effect on the image, but painting and other editing operations will<br />
work differently inside the selection.<br />
Paint to Select mode<br />
You can use Paint to Select mode (Select menu) to create a selection from scratch,<br />
or to modify an existing selection using standard painting and editing tools. In<br />
concept, it's similar to masking but in this case you're only adjusting what is<br />
selected on the layer, rather than the layer's bitmap (image) content.<br />
In the illustration below, (A) depicts the incomplete selection on a white flower<br />
when using the Colour Selection Tool. In Paint to Select mode (B) the selected<br />
regions appear as a red colour mask (grey here). To make a selection of the entire<br />
flower, the remaining unselected regions are painted with a brush (with white as<br />
foreground colour), making a completely filled-in flower (C); switching off Paint to<br />
Select reveals the fully selected flower (D).<br />
A B C D<br />
Painting in black subtracts from any selection, while painting in greyscale<br />
creates only partial selection (like an interior version of "feathering").
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